CCNA 1 and 2 Companion Guide, REVISED Third Edition



CCNA 1 and 2 Companion Guide, REVISED Third Edition

(Cisco Networking Academy Program)

ISBN: 1-58713-150-1

Cisco Press

Errata

Page 23 In the description of the Base 16 numbering system, replace Table 1-5 with:

Base 16 Number System

|Number of Symbols |16 |

|Symbols |0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F |

|Base Exponent |163 |162 |161 |160 |

|Place Value |4096 |256 |16 |1 |

|Example: 1A2C |1 |A |2 |C |

Example:

1A2C = (1 ∗ 163 = 4096) + (10(A) ∗ 162 = 2560) + (2 ∗ 161 = 32) + (12(C) ∗ 160 = 12) = (65536 + 2560 + 32 + 12) = 6700

Page 66 The second figure on the page, Figure 2-30 Dual-Ring Topology, should be replaced with the following figure. (Figure 2-21 on page 79 from the Fundamentals of Voice and Data Cabling Companion Guide.)

[pic]

Page 68 The first sentence of the second paragraph should read, “A logical topology describes the high-level structure of a network and depicts traffic flow.”

Page 90 The last sentence of the last paragraphs should read, “Examples of Layer 5 protocols are the X-Window System and AppleTalk Session Protocol (ASP).”

Page 91 The last sentence in the third paragraph should read, “Examples of Layer 3 protocols are Internet Protocol (IP) and Internetwork Package Exchange (IPX).”

Page 119 The second bulleted point in the fourth paragraph should read:

▪ TIA/EIA-569B—Formerly the TIA/EIA-569-A standard. This is a commercial building standard for telecommunications pathways and spaces.

Page 122 The first bulleted point in the last paragraph should read:

▪ Bandwidth—10 to 100 Mbps

Page 125 The first bulleted point in the second paragraph should read:

▪ Bandwidth—10 to 100 Mbps

Page 126 The first bulleted point in the third paragraph should read:

▪ Bandwidth—10 to 1000 Mbps

Page 132 The fourth sentence in the second paragraph should read, “The ratio of the speed of light in a vacuum to the speed of light in a material is called the material’s index of refraction (IR) and is expressed as follows:”

Page 140 In the last paragraph, the last bulleted point should read:

▪ Maximum cable length—More than 3,000 meters (or 3 kilometers) for single-mode; up to 2 km for multimode

Page 155 The last paragraph should read:

Like 802.11a, 802.11g uses Orthogonal Frequency Division Multiplexing and supports 54 Mbps. However, 802.11g is not compatible with 802.11a. For one thing, 802.11g uses 2.4 GHz, whereas 802.11a uses 5 GHz. On the other hand, 802.11g is backwards compatible with 802.11b. To support 802.11b, 802.11g also supports the complementary code keying (CCK) technique used in 802.11b.

Page 168 In Question 3 in “Check Your Understanding,” change the following answer:

D. 1-C, 2-A, 3-B

Page 183 In Figure 4-7 Shielded Twisted-Pair Cable, it should read “braided shield” and “foil shield.”

Page 210 The last bulleted point on the page should read:

▪ A crossover cable—A cable that crosses the critical pair to properly align transmit and receive signals on the device with line connections.

Page 232 In the first paragraph of “Routers and ISDN BRI Connections,” the second sentence should read:

In ISDN BRI service, a user (U) interface is the electrical interface for the twisted-pair wire connection from a Telco switch to a Network Termination 1 (NT1) device.

In the same paragraph, the fourth sentence should read:

A system (S) interface is the electrical interface between an NT2 and ISDN devices such as a computer or a telephone.

Page 258 In the “More Information: Ethernet II Frame (Continued)” section, the last four sentences in the paragraph should read:

To proceed from here, the first two octets of the 802.3 Data field are examined. The value found in those first two octets usually is checked for two unique values; if they are not present, the frame is assumed to be an 802.2 Logical Link Control (LLC) sublayer encapsulation and is decoded according to the 802.2 LLC encapsulation indicated. One of the two values tested for is OxAAAA in hexadecimal, which indicates an 802.3/802.2/SNAP encapsulation. The other value tested for is 0xFFFF. In this case, the bytes represent the first two bytes of an IPX Layer 3 header that is using the Novell raw Ethernet frame format.

Page 264 In Figure 6-11 CSMA/CD Process, in the lower right-hand corner of the figure, it should read:

Page 268 In the second paragraph, it should read:

As a rough estimate, 8 inches (20.32 cm) per nanosecond often is used for calculating propagation delay down a UTP cable.

Page 270 In the “More Information: Retransmission” section, the first sentence should read:

Retransmission is controlled by this formula:

0 = r < 2^k

Page 282 In the third paragraph, the bulleted points should read:

▪ 100BASE-T Full Duplex

▪ 100BASE-T Half Duplex

▪ 100BASE-TX Full Duplex

▪ 100BASE-TX Half Duplex

▪ 10BASE-T Full Duplex

▪ 10BASE-T Half Duplex

Page 304 In the first paragraph after Table 7-4 Parameters for 100-Mbps Ethernet Operation, the second sentence should read:

“Note that 1 bit-time in 100-Mbps Ethernet is 10 nsec = .01 microseconds = 1 100-millionth of a second.”

Page 311 In Table 7-6 Architecture Configuration Cable Distances, delete the following:

In the row for “One Class II repeater (half duplex),” in the column for “100BASE-FX and 100BASE-TX,” delete:

100m TX

208m FX

In the row for “Two Class II repeaters (half duplex),” in the column for “100BASE-FX and 100BASE-TX,” delete:

105m TX

211.2m FX

Page 320 In the third paragraph, the first sentence should read, "Full-duplex links can be substantially longer than what is shown in Tables 7-10 and 7-11 because they are limited only by the medium, not by the round-trip delay."

Page 325 In the first paragraph, the second sentence should read, "Just as with Gigabit Ethernet, with this increase in speed comes extra requirements--the bits being sent get shorter in duration (0.1 ns), occur more frequently, and require more careful timing."

Page 343 Delete the last sentence, which reads, “If switches are arranged in a simple hierarchical tree, no loops will occur, as shown in Figure 8-9.”

Page 344 Delete “Figure 8-9 STP Reducing Routing Loops.”

Page 356 Delete the first sentence, which reads, “An IP router is a router or workstation that runs any distance vector routing protocol.”

Page 368 In Figure 9-3 TCP/IP Application Layer Protocols, replace image with the following:

Page 379 The label for Table 9-1 should read, “Table 9-1 Powers of Two.”

In Table 9-1, 215 (two to the 15th power) should read, “32,768.”

Page 381 The label for Table 9-4 should read, “Table 9-4 Binary-to-Decimal Conversion of a 16-Bit Number.”

Page 394 In the third paragraph, the fifth sentence should read, “In Table 9-9’s example of a Class C IP address, bits from the Host field have been borrowed for the Subnet field.”

Page 396 In the third paragraph, the fourth sentence should read, “It provides

3.4 * 1038 addresses.”

Page 399 In Figure 9-38 RARP IP Address Assignment, replace “Source IP Address?” with “Sender Protocol Address.”

Page 407 In Table 9-11 ARP Table for 198.150.11.36, the two MAC addresses that start with “DD” should read:

FE:ED:C6:96:0b:21

FE:ED:C6:96:0b:23

Page 408 In the third paragraph, the fifth sentence should read, “If a device’s IP address matches the target protocol address in the ARP request, that device responds by sending the source its MAC address and possibly other information.”

Page 419 In the fourth paragraph, remove “AppleTalk” from the list of examples of routed protocols.

Page 424 In the second paragraph, the first sentence should read, “Most network services use a connectionless delivery system, as shown in Figure 10-7.”

Page 432 In Figure 10-14 Router ARP Tables, replace image with the following:

[pic]

Page 438 In Figure 10-21 Routing Tables, replace image with the following:

[pic]

Page 470 In the second paragraph, the second bulleted point should read, “Commonly used applications include NFS, DNS, rlogin, talk, FTP, NTP, and traceroute.”

Page 480 In Figure 11-10 UDP Segment Format, in the table's second column, the first row, "Designated Router (16)" should actually read, "Destination Port (16)," according to the information in the paragraph/bulleted points directly below Figure 11-10.

Page 487 In the last paragraph, remove the last sentence, which reads, “Data transfer can occur in American Standard Code for Information Interchange (ASCII) mode or binary mode.”

Page 488 The first paragraph should read, “After the file transfer has ended, the data connection terminates automatically. After you complete the entire session of copying and moving files, you might log off, thus closing the command link and ending the session.”

Page 503 In the Objectives, in the second column of bulleted questions on the right, delete the third question, “What is the role of a router in a WAN?”

Page 594 In Example 3-6 Configuring a Serial Interface, the example should read:

Router(config)# interface serial 1/0

Router(config-if)# ip address

Router(config)# interface serial 0/0

Router(config-if)# clock rate 56000

Router(config-if)# no shutdown

Page 620 Replace the entire existing paragraph with the following paragraph:

On Cisco IOS Release 10.3 or higher, CDP is enabled by default on all supported interfaces to send and receive CDP information. However, on some interfaces, such as asynchronous interfaces, CDP is disabled by default. If CDP is disabled use the cdp enable command in interface configuration mode. To disable CDP on a specific interface after it has been enabled, use the no cdp enable command in interface configuration mode.

Page 641 In Example 5-1 Booting from Flash Memory, replace the third line with the following:

Router(config)#boot system tftp IOS-image 172.16.13.111

Page 643 In Example 5-3 Configuration Router, on the second line of output, the following should be highlighted:

Version 12.1 (5) (in the 4th row)

flash:c2500-js-l_121-5.bin (in the 10th row)

Configuration register is 0x2142 (in the 17th row)

Page 644 In the More Information: Displaying the Currently Running Cisco IOS Software Version box, the following should be highlighted:

In the second paragraph, the second sentence should read, “The screen captured shows Software Release 12.1(5).”

In the third paragraph, the first sentence should read, “The next highlighted portion of the output shows the system image file is c2500-js-l, booted using Flash.”

In the fourth paragraph, the second sentence should read, “The final highlighted output provides the targeted results of the command config- register 0x2102.”

Page 651 In Example 5-6 Copying the Configuration File from a TFTP Server, all of the IP addresses should be changed to:

172.16.2.2

Page 669 In the "Static Route Operation" section, Step 2 should only read:

The router installs the route in the routing table.

Page 670 Example 6-1 IP Route Using Interface should read:

Hoboken(config)# ip route 172.16.5.0 255.255.255.0 s0

Example -2 IP Route Using Next-Hop Router IP should read:

Hoboken(config)# ip route 172.16.5.0 255.255.255.0 172.16.4.2.

Page 670 In the last paragraph on the page, the last sentence should read:

The intermediate IP address 172.16.4.2 has to be looked up in the routing table before the router knows which exit interface it can use.

Page 671 After the first paragraph, delete the last two numbers, “10,” in the ip route command. The ip route command should read only as follows:

172.16.3.0 255.255.255.0 192.168.2.1 255

Page 763 In Figure 8-11 Redirect Request, Host A should be changed to read as, “Host B.”

Page 766 In the second paragraph, the first sentence should read:

This broadcast is received by 172.16.5.1, the local router. The router responds with the address mask reply:

Page 775 In the first paragraph, the last sentence should read:

In other words, for any routes using next-hop IP addresses, the router must conduct a second lookup in the routing table on the next-hop IP address to find its directly connected network—its exit interface. Example 9-1 shows the show ip route command output.

The following example should be inserted after the first paragraph:

Example 9-1 RTA# show ip route Command Output

[pic]

Page 777 In the “Determining L2 and L3 Addresses” section, the first sentence in the first paragraph should read, “While data link layer (Layer 2) addresses, also known as MAC addresses, are used to get frames from source to destination, it is important to understand that a different type of address is used to get packets from one router to the next.”

Page 780 In the “Determining the Last Routing Update” section on this page only, the last sentence should read:

Example 9-2 shows the output for the command show ip route.

Example 9-1 should read:

Example 9-2 show ip route Command Output

Note: The numbering and references of all Chapter 9 examples will change after the addition of the new Example 9-1. After Example 9-1 is added, all subsequent examples will remain the same in the text, but the examples will need to be renumbered: Example 9-2 will become Example 9-3; Example 9-3 will become Example 9-4, and so forth. There should be 17 examples total in Chapter 9.

Page 789 The label for Table 9-3 should read:

Table 9-3 ICMP Message Types

Page 810 In Figure 10-2 Application Layer Protocols, in the box on the right-hand side, under File Transfer, there should be an asterisk after “FTP,” the second bulleted word. It should look like:

FTP*

Page 844 In Table 11-1, Protocols, ACLs, and Their Corresponding Numbers, to the right of the “IP” (protocol) in the “Range” column, the range should read:

1 to 99, 1300-1999

Page 853 In the second paragraph, the full syntax should be replaced with the following:

[pic]

Page 867 In Example 11-8 Restricting vty Access with ACLs (Continued), after the third line, all of the following three lines should read:

Rt1(config-line)# login

Rt1(config-line)# pasword secret

Rt1(config-line)# access-class 2 in

Page 981 In Appendix B: Check Your Understanding Answer Key, for Chapter 10, the answer to Question 10 should be:

10. B

CD-ROM The updated Case Study Materials are located at title/1587131501.

The updated movie on the CD-ROM, “Class B Subnetting Part I,” can be downloaded at title/1587131501.

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Wait for n

microseconds.

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